According to theHarry Potterbooks, Albus only has one brother (Aberforth).
So thats what we know.
What we dont know is pretty much everything else.
Jaap Buitendijk/Warner Bros.
But lets look closer.
First, lets assume Grindelwald is telling the truth.
And aspointed out by The Rowling Library, the ages dont add up.
Whats also unclear is whether Albus knows Credence is his brother.
There are theories out there.
Perhaps Arianas Obscurus is possessing Credence and thats the brother Grindelwald is referring to?
Maybe Credence is actually Arianas secret son (but then who is the brother?).
Could Albus father have conceived Aurelius at Azkaban?
(Having sex with Dementors hovering around seems pretty tough to pull off.)
One thing is for sure: Rowling wouldnt make this move without a clear explanation.
